IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: A train 125 m long passes a man, running at 4 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is: 1670 0

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    49 kmph
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    50 kmph
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    51 kmph
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  • 4
    52 kmph
    सही
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उत्तर : 1. "49 kmph"
व्याख्या :

Answer: A) 49 kmph Explanation: Speed of the train relative to man = (125/10) m/sec = (25/2) m/sec. [(25/2) x (18/5)] km/hr = 45 km/hr. Let the speed of the train be 'x' km/hr. Then, relative speed = (x - 4) km/hr. x - 4 = 45 => x = 49 km/hr.

प्र: At what rate percent on simple interest will Rs.415 amount to Rs.514 in 4 years  ? 1429 0

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    4.58 %
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    5.96 %
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    6.52 %
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    4.98 %
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उत्तर : 2. "5.96 %"
व्याख्या :

Answer: B) 5.96 % Explanation: Difference in amount = 514 - 415 = 99 99 = (415 x 4 x R)/100 R = 5.96%

प्र: A 260 m long train running at the speed of 120 km/hr crosses another train running in opposite direction at the speed of 80 km/hr in 9 sec. What is the length of the other train  ? 1493 0

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    240 mts
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    270 mts
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    260 mts
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    250 mts
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उत्तर : 1. "240 mts"
व्याख्या :

Answer: A) 240 mts Explanation: Relative speed = 120 + 80 = 200 km/hr.= 200 x 5/18 = 500/9 m/sec. Let the length of the other train be L mts.Then, (L + 260)/9 = 500/9 => L = 240 mts.

प्र: Where is the headquarters of the United Nations Economic and Social Council (ECOSOC)  ? 1953 0

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    Berlin
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    C)  ? A) Berlin B)
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    ? A) Berlin B) Spain C) London
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    New York
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उत्तर : 4. "New York"
व्याख्या :

Answer: D) New York Explanation: The Economic and Social Council (ECOSOC) is one of the six principal organs of the United Nations for coordinating the economic, social and environmental issues, as well as for implementing internationally agreed development goals. Recently, it is in news because India has been re-elected to the United Nations ECOSOC for another 3-year term. India was among 18 nations to win election to the Economic and Social Council (ECOSOC). India obtained 183 votes, the second highest after Japan in the Asia Pacific category. The elected members of ECOSOC for a three-year term beginning 1 January, 2018 are Belarus, Ecuador, El Salvador, France, Germany, Ghana, India, Ireland, Japan, Malawi, Mexico, Morocco, Philippines, Spain, Sudan, Togo, Turkey and Uruguay. The headquarters of the ECOSOC is located in New York, Unites States.

प्र: Math Challenge 1808 0

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    7
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    44
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    4
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    33
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उत्तर : 3. "4"
व्याख्या :

Answer: C) 4 Explanation: Let the required number be 'N' given that its quarter i.e; N/4 exceeds its double i.e, 2N by 7 => N/4 + 7 = 2N => N + 28 = 8N 7N = 28 N = 4.

प्र: Logic Challenge 1616 0

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    40
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    20
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    2
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    36
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उत्तर : 3. "2"
व्याख्या :

Answer: C) 2 Explanation: In the starting it is given that Couple went to the movie and No other went with them. So total members went to movie is only 2.

प्र: Calender Puzzle 1620 0

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    A
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    B
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    C
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    D
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उत्तर : 4. "D"
व्याख्या :

Answer: D) D Explanation: We can't determine the last day of the next month which has 31 days because we don't know the days in present month which may be 30 or 31. And the next month may be March which contains 31 days  which implies that the present month may be February which contains 28 or 29 days.

प्र: The Jigme Dorji National Park is located in which country  ? 1908 0

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    Myanmar
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    Bhutan
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    India
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    Nepal
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उत्तर : 2. "Bhutan"
व्याख्या :

Answer: B) Bhutan Explanation: The Jigme Dorji National Park is the second-largest National Park of Bhutan. The park provides sanctuary for 37 known species of mammals including several endangered, threatened or vulnerable species, such as the takin, snow leopard, clouded leopard, Bengal tiger, bharal or Himalayan blue sheep, etc. It is also home to the Indian leopard, serow, sambar, barking deer, goral, marmot, pika and more than 300 species of birds. It is also the only park in Bhutan where the national animal (takin), flower (blue poppy), bird (raven) and tree (cypress) exist together.

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